JP2888549B2 - Multi-channel audio output device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-channel audio output device such as a high-definition television receiver, and more particularly to control of connection between an audio channel and a reproduction system (speaker).

[Conventional technology]

Compared to NTSC television receivers, HDTV receivers double the number of scanning lines, widen the screen, and increase the number of pixels by a factor of 5, thereby increasing the visual quality of high-definition, large-screen displays. Realism can be obtained.
On the other hand, transmission channels for four channels are secured so that a high sense of reality can be obtained from voice, and the 3-1 system (3 forward channels) is used.
(1 channel, rear 1 channel) stereo broadcast is being considered. In this 3-1 system 4-channel stereo broadcast, in consideration of the case of viewing by a plurality of people, the gap between the video and the sound image is small in a wide range, and three channels are provided forward so that good viewing can be performed. One independent channel is provided at the rear in order to obtain.

In the high-definition broadcasting, an audio transmission path is provided for four channels. Therefore, in addition to the four-channel stereo broadcasting including the 3-1 system, the monaural, audio multiplexing (duplex), and stereo of the audio system of the current television broadcasting are provided. Broadcasting, other three-channel broadcasting, and four-channel stereo other than the 3-1 system (2-2 system: front two channels, rear two channels) and the like can also be realized.

FIG. 4 shows the relationship between the audio system and the audio channel. Here, the main main sound, L is the left channel audio, R represents the right channel audio, C is the center channel audio, S is the surround channel audio, L _F is the front left channel audio, R _F is the front right channel audio, L _B Is the rear left channel audio, R _B
Indicates the rear right channel sound. FIG. 5 shows a connection relationship between an audio channel and a reproduction system (speaker) in each audio system.

FIG. 2 shows the arrangement of various reproduction systems (speakers). FIG. 2A shows the arrangement of two speakers, and FIG.
The arrangement of one system and four channels stereo, FIG.
2 shows an arrangement of a 2-system 4-channel stereo. In the figure, 51 is a high-vision display, 52 is a front left channel speaker, 53 is a front right channel speaker, 54 is a center speaker, 55 is a rear left channel speaker, and 56 is a rear right channel speaker.

The monaural audio signal is sent to the audio channel 1 (CH1) and reproduced by the speaker 1 (SP1) and the speaker 2 (SP2). The speaker arrangement at that time is shown in FIGS.
Either case of (c) may be used.

The stereo audio signal is transmitted on audio channel 1 (CH1) and audio channel 2 (CH2), and is reproduced by speaker 1 (SP1) and speaker 2 (SP2). Also in this case, the speaker arrangement in FIG. 2 may be any of the cases shown in FIGS.

3-1 system 4-channel audio signal is audio channel 1
L is sent to (CH1), R is sent to audio channel 2 (CH2), C is sent to audio channel 3 (CH3), and S is sent to audio channel 4 (CH4), and the speaker arrangement (SP1-L, SP2-R, SP3
-C, SP4-S) for optimal playback. If the speaker arrangement is (a), L and R can be correctly reproduced, but C and S are not output. In the speaker arrangement (c), the center channel sound is output from the rear left channel.

The audio signal of the 2-2 system 4-channel audio signal is the audio channel 1
To (CH1) L _F, C, is S in the audio channel 4 (CH4) is sent to the R _F, audio channel 3 (CH3) to the voice channel 2 (CH2), speaker placement Figure 2 (c) (SP1- L _F , SP2-R _F ,
_{SP3-L B, SP4-R} B) with optimum reproducing can be performed. If the speaker arrangement is (a), L and R can be correctly reproduced, but C and S are not output. In the speaker arrangement (c), the center channel sound is output from the rear left channel.

The audio signal of the 2-2 system 4-channel audio signal is the audio channel 1
To (CH1) L _F, C, is S in the audio channel 4 (CH4) is sent to the R _F, audio channel 3 (CH3) to the voice channel 2 (CH2), speaker placement Figure 2 (c) (SP1- L _F , SP2-R _F ,
_{SP3-L B, SP4-R} B) with optimum reproducing can be performed. If the speaker arrangement is (a), L and R can be correctly reproduced, but C and S are not output. When the speaker arrangement is (b), the sound of the rear left channel is output from the center channel.

[Problems to be solved by the invention]

As described above, since multiple types of audio systems are broadcast in multi-channel audio such as a high-definition receiver, the connection between the audio channels and the playback system (SP), that is, the number and arrangement of speakers are uniquely determined. If this is the case, there is a problem that a certain audio system causes a problem that sound is reproduced from a direction different from the original reproduction direction or a certain audio channel cannot be reproduced.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems of the related art, and when a connection between an audio channel and a reproduction system (speaker) is uniquely determined, an audio channel of any audio system is lost. To provide a multi-channel audio output device that can reproduce without any trouble such as reproduction from a direction different from the original reproduction direction, and that can connect a reproduction system (speaker), that is, arbitrarily select the number and arrangement of speakers. Aim.

[Means for solving the problem]

In a multi-channel audio output device that receives a multi-channel audio signal and an audio system control signal as input, a speaker arrangement setting unit for setting an arrangement of a sound reproduction speaker, and a setting value set by the speaker arrangement setting unit; A controller that outputs a connection pattern indicating a connection relationship between the programmed multi-channel audio signal input and the audio reproduction speaker according to the audio system control signal, and a plurality of channels of audio signals are controlled by the controller control signal. Audio signal synthesizing means for synthesizing into two-channel audio signals, and audio for selecting which channel audio signal and output signal of the audio signal synthesizing means to output to which audio reproduction speaker by a control signal of the controller. Signal selection means.

[Action]

In the present invention, the speaker arrangement setting means for initially setting the arrangement and the number of audio reproduction speakers is connected to a microcomputer or a similar controller programmed with a predetermined connection pattern, and an output signal of the microcomputer is transmitted from an audio channel. It is connected to an audio signal selection means (channel selection circuit) and an audio signal synthesis means (channel mix circuit) for selecting connection to a reproduction system (speaker), and controls the reproduction system to have a desired connection.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an overall configuration of a high-definition television receiver having a function of initializing the arrangement and the number of speakers according to an embodiment of the present invention. In FIG. 1, numeral 2 indicates a radio wave (12 GHz) received from a satellite. , A parabolic antenna for converting to a 1 GHz signal, and 3 is a MUSE tuner for selecting a necessary channel from the signal transmitted from the parabolic antenna 2 and outputting a MUSE baseband signal. Here, MUSE is Mu
ltiple Sub-nyquist-Sampling Encoding, NTSC
High-definition information more than five times that of broadcast
Bandwidth compression technology that can be sent on a channel. The PCM audio channel is also information-compressed and time-multiplexed during the vertical retrace interval of the video signal.

4 is a low-pass filter (hereinafter referred to as a low-pass filter) that removes signals outside the band.
5 is an A / D converter, 6 is an audio digital signal processing unit, which separates the audio signal from the video signal and converts it to an audio rate.
It decodes the quasi-instantaneous companding differential PCM and outputs a 4-channel digital audio signal. 7 to 10 are D / A converters for converting audio digital signals into analog signals, 11 to 14 are L
PF, and the signal of audio channel 1 is transmitted from LPF11 to LPF12.
The signal of the audio channel 2 is obtained from the LPF 13, the signal of the audio channel 3 is obtained from the LPF 13, and the signal of the audio channel 4 is obtained from the LPF 14. 15, 22 to 25 are selectors for switching analog signals according to a command from the microcomputer 34, 16, 18 are 3-input adders, 17, 19 to 21 are 2-input adders, and 26 to 29 are amplifiers for driving speakers. , 30-33 are speaker SP1
An audio output terminal 34 connected to SP4, an audio system control signal 34 from the MUSE audio digital signal processing unit 6 (in this embodiment, monaural, stereo, 3-1 system stereo, 2-2 system 4 channel stereo) Audio signal output terminal 30 according to the set value of the speaker arrangement and the number of speakers.
Selector 1 so that the desired audio signal is output to
Microcomputer controlling 5, 22 to 25, 35
Is a setting switch for setting the arrangement and number of speakers and sending a command to the microcomputer 34.

FIG. 3 shows the speaker arrangement of FIG. 2 ((a),
(B), (c)) shows the most suitable audio output format for each audio system. This format is designed so that a certain audio channel is not lost or different from the original reproduction direction in any audio system with the set speaker arrangement and number.

 Hereinafter, the operation of FIG. 1 will be described with reference to FIG.

The radio wave from the satellite received by the parabolic antenna 2
Converted to MUSE baseband signal by MUSE tuner 3, LP
The signal is converted into a digital signal by the F4, A / D converter 5. An audio signal that is time-division multiplexed at the retrace time of the video signal is selected, and the MUSE audio digital signal processing unit 6 performs error correction, decodes the quasi-instantaneous companding differential PCM, etc., and obtains a 4-channel digital audio signal. D / A converter 7-10, LPF11-14
Is an analog audio signal, and each audio channel and adder
Select the desired audio output shown in FIG. 3 with selectors 15 and 22 to 25 of the audio signal mixed by 16 to 21 and a speaker drive amplifier.
The signal is amplified by 26 to 29 and output to each speaker from audio output terminals 30 to 33. In the microcomputer 34, the selectors 15, 22 to 25 are controlled by the audio system control signal from the MUSE audio digital audio processor 6 and the control signal from the speaker arrangement and number setting switch 35.

Next, the audio selecting and mixing operations will be described in detail with reference to FIG.

The setting switch 35 has two speakers (FIG. 2 (a)). (A) When the audio system is monaural The selector 22 and the selector 23 are "00", the selector 15 is "0", and the selector 24 is "10". The selector 25 selects "10", outputs the audio channel 1 (main output) from the audio output terminals 30 and 31, and the audio output terminals 32 and 33 have no output.

(B) When the audio system is 2-channel stereo The selectors 22 and 23 select "00", the selector 15 selects "1", the selector 24 selects "10", and the selector 25 selects "10", and outputs the audio. Audio channel 1L is output from terminal 30 and audio channel 2R is output from audio output terminal 31.
32 and 33 have no output.

(C) When the audio system is a 3-1 system 4-channel stereo: The selectors 22 and 23 select "01", the selector 15 selects "1", the selectors 24 and 25 select "10", and the audio output terminal L + C + S mixed by adder 16 from 30
Is mixed by the adder 18 from the audio output terminal 31 into R + C
+ S is output, and the audio output terminals 32 and 33 are non-output.

(D) When the audio system is a 2-2 system 4-channel stereo: The selectors 22 and 23 select "10", the selector 15 selects "1", the selectors 24 and 25 select "10", and the audio output terminal the mix at the adder 17 from the 30 L _F + L _B, and outputs the R _F + R _B were mixed in the adder 19 from the audio output terminal 31, audio output terminals 32 and 33 is a non-output.

(2) When the setting switch 35 is a 3-1 type 4 speaker (FIG. 2 (b)) (a) When the audio type is monaural Same as the above (1)-(a) (b) The audio type is 2 channels In the case of stereo: Same as (1)-(b) above. (C) When the audio system is a 3-1 system, 4-channel stereo. The selector 22, the selector 23, the selector 24, and the selector 25 are "00", and the selector 15 is "1". Select "30
The audio channel 1L is output from the audio output terminal 31, the audio channel 2R is output, the audio output terminal 32 outputs the audio channel 3C, and the audio output terminal 32 outputs the audio channel 4S.

(D) When the audio system is the 2-2 system and 4-channel stereo The selector 22 and the selector 23 select "00", the selector 15 selects "1", the selector 24 selects "10", and the selector 25 selects "01". The audio output terminal 30 outputs the audio channel 1L, the audio output terminal 31 outputs the audio channel 2R, and the audio output terminal
32 is no output, audio output terminal 33 was mixed by adder 21
And outputs the L _B + R _B.

(3) When the setting switch 35 is a 2-2 type 4 speaker (FIG. 2 (c)) (a) When the audio type is monaural Same as the above (1)-(a) (b) The audio type is 2 channels In the case of stereo: Same as (1)-(b) above. (C) When the audio system is a 3-1 system 4-channel stereo: The selector 22 and the selector 23 are “11”, the selector 15 is “1”, and the selector 24 is “01”. The selector 25 selects “00”, and the L + C mixed by the adder 17 from the audio output terminal 30
Is mixed by the adder 22 from the audio output terminal 31
And the audio channel 4S is output from the audio output terminals 32 and 33.

(D) When the audio system is the 2-2 system and 4-channel stereo The selector 22 and the selector 23 select "00", the selector 15 selects "1", the selector 24 and the selector 25 select "00", and the audio output terminal. Audio channel 1L _F from 30 and audio output terminal
The voice channel 2R _F than 31, the voice channel 3L _B from the audio output terminal 32, and outputs the voice channel 4R _B from the audio output terminal 33.

The above control program is provided to the microcomputer 34, and the control shown in FIG. 3 can be realized.

In the above embodiment, the means for setting the speaker arrangement and number is realized by a switch, but may be set remotely by a remote control switch or the like, or the set value may be stored in a microcomputer having a nonvolatile memory or the like. In addition, the configuration may be such that it is initialized when the power is turned on, and the same effects as those of the above embodiment can be obtained.

In the above embodiment, the switching and mixing of the audio channels are performed after the audio signals are converted into analog signals by the D / A conversion. However, the switching and mixing of the channels are performed while the digital audio signals remain unchanged. A configuration in which A conversion is performed, an analog audio signal is converted, and the analog audio signal is output may be used.

The audio system has been described with four types of monaural, stereo, 3-1 system 4-channel stereo, and 2-2 system 4-channel stereo. However, other broadcasts that can be considered as a combination of audio channels, such as audio multiplex broadcasting and stereo + monaural broadcasting. Any configuration may be used, and the arrangement and number of speakers have been described with reference to the three types in FIG. 2. However, any other cases such as three speakers and five speakers may be used, and the arrangement and number of speakers are set. The effect of the present invention can be obtained by providing the means.

Further, the microcomputer 34 is used to control the switching of the audio channel. However, this may be a controller using another control ROM or the like, and has the same effects as described above.

〔The invention's effect〕

As described above, according to the multi-channel audio output device of the present invention, the means for setting the arrangement and number of speakers is provided, and the audio channels are switched for each audio system according to the set speaker arrangement and number. Since channel mixing and the like are performed, there is an effect that a multi-channel audio output device that can always perform optimal viewing with any speaker arrangement and number is obtained.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an audio unit of a high-definition receiver provided with means for setting the arrangement and number of speakers according to an embodiment of the present invention. FIG. 2 is a diagram illustrating an example of a speaker arrangement of the high-definition receiver. FIG. 3 is a diagram showing an optimum audio output format for each audio system corresponding to the speaker arrangement of FIG. 2, FIG. 4 is a diagram showing a relationship between the audio system and the audio channel, and FIG. FIG. 3 is a diagram illustrating a connection relationship between an audio channel and a reproduction system. In the figure, reference numeral 6 denotes a MUSE audio digital signal processing unit;
10 is a D / A converter, 11 to 14 are LPFs, 15, 22 to 25 are selectors, 1
6 to 21 are adders; 34 is a microcomputer; and 35 is a switch for setting the arrangement and number of speakers. In the drawings, the same reference numerals indicate the same or corresponding parts.

──────────────────────────────────────────────────続 き Continuation of the front page (51) Int.Cl. ⁶ Identification symbol FI H04S 5/02 H04N 7/00 A (56) Reference JAS Conference '88 Proceedings "Hi-vision from the viewpoint of audio" (58) Fields surveyed (Int.Cl. ⁶ , DB name) H04S 1/00-7/00

Claims (1)

(57) [Claims] 1. A multi-channel audio output device that receives a multi-channel audio signal and an audio system control signal as input, and sets a speaker arrangement setting means for setting an arrangement of an audio reproduction speaker, and sets the speaker arrangement setting means. A controller configured to output a connection pattern indicating a connection relationship between the programmed multi-channel audio signal input and the audio reproduction speaker according to the set value and the audio system control signal; An audio signal synthesizing means for synthesizing an audio signal of a channel into an audio signal of two channels; and an output signal of an audio signal of which channel and an output signal of the audio signal synthesizing means are output to which audio reproducing speaker by a control signal of the controller. Sound signal selecting means for selecting Multi-channel audio output device.